* `/lib`: Dart source code
    * 🐤 `main.dart`: Flutter app entrypoint code
    * `src/rust`: Auto generated glue, mirroring the whole Rust crate
* `/rust`: Rust source code
    * 🦀 `src/api/simple.rs`: Write your Flutter-facing code anywhere within `api` folder
    * `frb_generated.*.rs`: Auto generated glue
* `/android`, `/ios`, `/linux`, `/macos`, `/web`, `/windows`, `/integration_test`, `/test`, `/test_driver`: Other standard Flutter folders
* `/rust_builder`: Ignore it (glue to build Rust with Flutter)
